Forging machine



Dec. 24, 1929. c. F. 056000 FORGING MACHINE Filed June 6. 1928 5 sheets-sheet 2 lvwenimw LVZQPZQSE 03 90062. 444 14' m,

Dec. 24, 1929.

c. F. OSGOOD 1,740,708

FORGING MACHINE Filed June 6. 19:28 5 Sheets-Sheet 3 9 6 15 j 17% 2 4 a 24 4% 4 a? d m 1 7 -5 UNIT 1:?!

STATES PATENT OFFICE CHARLES F. OSGOOD, OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS FORGING Application filed June 6,

This invention relates to improvements in forging machines and more particularly to an improved pinning or drill steel hole punching device.

In forging the bit end of hollow drill steels when resharpening, the hole becomes closed and it is necessary to reopen it as the final step of resharpening. This is now very commonly accomplished by driving a pin or punch into the steel by a series of hammer blows and upon completion of the forward driving to remove the punch by imparting thereto a hammer action in the opposite direction. In a copending application of Wade H. lineman, Ser. No. 65,452 filed Oct. 28, 1925, there is disclosed a hole punching mechanism of the same general character as shown in the present application. One of the improvements which the invention seeks to provide over the construction shown in the aforesaid application is to employ a hammering motor for withdrawing the punch from the drill steel which is capable of producing a number of repeated blows and which has a distribution system entirely independent of the fluid. distribution system of the motor for driving the punch into the steel. Another object of the invention is to provide means for transmitting the impact of the rearward hammering motor directly to the punch independently of the frame which sup-' ports the motors. Other objects and advantages of the invention will appear during the course of the following specification.

In the accompanying drawings I have shown for purposes of illustration one preferred form and two modifications thereof which my invention may assume in practice.

In these drawings,-

Fig. 1 is a side elevation of the entire apparatus.

Fig. 2 is a plan view partly broken away.

Fig. 3 is an end elevation with part of the base shown in section.

Fig. 4 is a central vertical longitudinal section through the mechanism on line 4l of Fig. 2.

Fig. 5 is a horizontal section taken on line 5'-'5 of Fig. 4.-

MACHINE 1928. Serial No. 283,332.

Fig. 6 is a side elevation of parts of the ap paratus illustrating a modified form.

Fig. 7 is a horizontal section corresponding to the section shown in Fig. 5 on line 77 of Fig. 6.

Fig. 8 is a transverse section on line 8-8 of Fig. 6.

Fig. 9 is a side elevationillustrating a still further modification.

In the preferred embodiment of my invention illustrated in Figs. 1 to 5, I have shown a base or standard 1 having horizontally projectin portions 2 and 3 at its upper end. On the arm 2 is mounted a suitable vise generally indicated at 8' for clamping a drill steel 4. As shown in Fig. 3, a supporting bracket -5 is secured to the arm 3 by suitable bolts 6 and carried by this bracket are suitable ways or guides 7 in which is slidably mounted a frame 8. Mounted for limited movement between a pair of laterally projecting lugs 9 and 10 secured at opposite ends of the frame is a hammering motor 11 which may be of any suit able standard type. A pin or punch 12 is mounted in the chuck of this hammering motor and is slidably supported between the bifurcations of lug 10. The punch has an internal collar 13 which is adapted to engage the chuck of the hammering motor and preferably a washer 14: is interposed between the collar andlug 10. Motive fluid for operating the motor 11 is supplied through a connection 15 under the control of a reciprocable valve 16 to the valve'chest 17 in the rear head of the motor. The valve is normally held in closed position as illustrated by pressure transmitted through a passage 15. A valve 18 controls the admission of motive fluid to opposite ends of the cylinder of the motor and also controls the exhaust through an eX- haust port 19 leading to the atmosphere. The hammer piston 20-has a striking portion 21 which hammers on the shank of the drill steel punch. The reciprocable'valve 16 is actuated by engagement with a head member 22 which is slidably connected to the rear head of the motor. A spring 23 mounted on a bolt 24 acts upon member 22 normally to hold the latter against the lug 9. For the purpose of controlling the operation of the hammering motor 11 a suitable hand operated lever is pivoted at 26 on the arm 2 of the base and this lever serves to actuate a horizontal link 27 pivotally connected thereto. This link 27 has a laterally extending portion 28 which bears against lug 9 and thus serves to actuate the frame 8 forwardly relative to the guideways 7.

Directly below the forward hammering motor and secured to the frame 8 by suitable rods 29 is the cylinder 30 of a second hammering motor, the piston being indicated by numeral 31. This motor is preferably of a well known valveless type having a longitudinally extending inlet passage 32 which opens into the cylinder through a pair of inlet ports 33 which serve continuously to supply pressure fluid to the annular groove 34 around a reduced central portion of the piston. Admission of motive fluid to opposite ends of the piston 31 is automatically controlled by the piston so as to admit motive fluid to one end of the cylinder when the annular groove is in communication with a passage 35 and to the opposite end of the cylinder when'the annular groove is in communication with a passage 36. It will be noted that this latter passage opens through a pair of ports 37 and 38, the latter serving as a starting port when the piston stops in central position. Exhaust takes place through the piston controlled ports 39 and 40 in the cylinder wall. 1 Motive fluid for operating the reverse hammering motor may be supplied through a connection 41 which also supplies motive fluid to the connection 15 through a conduit 42. Motive fluid is thus constantly supplied to a valve chest 43 and a suitable valve 44 controls communication between this valve chest and a passage 45 which leads to the longitudinal inlet passage 32 of the reversing motor. A stop or bracket 46 is mounted on the horizontal link 27 in position to engage a stem 47 which is connected to valve 44.

The mode of operation of the preferred embodiment of my invention, it is believed, will be readily apparent in view of the above description. of the construction. When it is desired to drive the pin 12 into the punch for the purpose of opening the partly closed hole 48, the operator moves the lever 25 to the right as viewed in Fig. 1 which acts to move the frame 8 and accordingly the punch 12 toward the drill steel which is held in the jaws of the vise 3. When the punch engages the drill steel its movement is resisted and upon continued movement of the frame 8, the member 22 will engage valve 16 and operate the same to open position; The piston 20 is thereby reciprocated, driving the punch into the drill steelas long as the operator exerts the necessary force on lever 25. When the punch has been driven a su'flicient distance to open up the hole properly, the operator releases the pressure on lever 25 and moves it in the reverse direction. This, of course, causes the forward hammering motor to be stopped and upon continued movement of the lever 25 in the reverse direction, the stop 46 will engage the valve stem 47 and supply motive fluid to the reverse hammering motor. The piston 31 thereupon strikes a number of repeated blows directly against the frame 8 and this impact is transmitted through the lug l0 and washer 14 to the collar 13 and the punch is thus effectively hammered'out of the hole.

In the modification shown in Figs. 6, 7 and 8, the cylinder 30 of the reversing motor, instead of being bolted to the frame 8, is formed integral therewith and the rear head 49 is movable relative to the cylinder 30. The cylindrical portion 50 of this head is made to fit closely into the bore of the cylinder. Slidably mounted on this cylinder and in front of a pair of lugs 51 is a collar 52 which has an upward projection 53 corresponding to the lug 10 in the preferred form illustrated in Fig. 1. The collar 52 is connected to the movable head 49 by a pair of tie rods 54. The purpose of this construction is to permit the impact from the hammer piston 31 to be transmitted directly through the head member 49, rods 54 and collar 52 to the punch 12 without hammering upon the movable frame which carries the forward impact motor. In all other respects the construction and operation of this modification are the same as in the preferred embodiment.

In the modification shown in Fig. 9, the construction is very similar in most respects to the preferred embodiment except that the reverse hammering motor is mounted in alinement with the forward impact motor. The frame provides a suitable vertical abutment 55 whereby the cylinder 30 of the reverse motor may be rigidly secured to the frame by tie rods 56. The position of link 57 is somewhat different from the position of link 27 in the other forms so that the stop 46 'carried thereby may aline with the stem 47 of the control valve which in this instance is located in vertical alinement with the two motors. The operation of this formof my invention is identical with the operation of the preferred form which has already been described.

As a result of my invention it will be clear that I have provided suitable means for imparting a series of repeated blows for the purpose of hammering the punch out of the hole in the drill steel so that the pin may be very easily and quickly removed, no matter how far it has been driven into the hole in the drill steel. It will further be observed that in at least one modification of my invent-ion means are provided which allow the impact stress of the rearward hammering motor to be imparted directly to the punch instead of being transmitted through the frame. Also the operation of the rearward impact motor is not made to depend in any way upon the operation of the forward impact motor since it has an entirely independent fluid distribution system.

While I have in this application specifically described one form and two modifications which the invention may assume in practice, it will be understood that this form and these modifications of the same areshown for purposes of illustration and that the invention may be modified and embodied in various other ways without departing from the spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. A punch mechanism comprising a punch, a hammering motor for driving said punch into the work, a frame on which said hammering motor and punch are carried, a second hammering motor for delivering, during a period throughout which said first mentioned hammering motor remains inactive, a series of repeated blows, said second motor having a rear cylinder head for receiving said blows, and means for transmitting impact from said cylinder head to said punch for withdrawing the same from the work.

2. A punch mechanism as set forth in claim 1 wherein independent fluid distribution systems are provided for said motors.

3. A punch mechanism as set forth in claim 1 having in addition, means movable in one direction to admit motive fluid to the forward hammering motor and in the opposite direction to admit motive fluid to the motor for withdrawing the punch.

4. A punch mechanism comprising a punch, a hammering motor for drivin said punch into the work, a frame on which said motor and punch are carried, a second hammering motor also carried by said frame comprising a cylinder, a piston reciprocable therein, a movable head member against which said piston is adapted to strike, a member movably supported on said cylinder and engaging said punch, and tie rods for connecting said head member to said movably supported punch engaging member whereby the hammering action of said last mentioned motor is imparted to the punch for withdrawing the same from the work.

5. A punch mechanism comprising a punch, a hammering motor for driving said punch into the work, a frame on which said motor and punch are carried, a second hammering motor for delivering a series of repeated blows, each of said motors having a fluid distribution system independent of the fluid distribution means of the other motor, a rear cylinder head against which the blows of said second hammering motor are struck, and means for transmitting the impact of said blows from said head to said punch for withdrawing the same from the work including a pair of rods and a member connected thereto adapted to engage said punch.

In testimony whereof I afliX my signature.

CHARLES F. OSGOOD. 

